Dyno Results Compilation
Asleep at the wheel
Joined: Jan 2008
Posts: 39
Likes: 1
From: South Africa
Low on Power
Hi guys
Had my 2003 stock std rx8 on my own dyno this weekend.
My car was feeling low on power since I bought it in Nov 2007. So I started browsing the net and this Forum for any info. So far the only thing that might make sense is coils. The car has 86000 km on the clock and in very good condition. I'm the second owner and the car's got full service history. (contact the mazda service deparment). Mazda says there is nothing wrong with my car and there is also no fault codes. Did a ECU reset and had a small improvement in midrange. While the car was on the dyno I also checked if all the valves and gizmo's work, they do!
So all I got out the car was 97rwkw(131.08 rwhp) while braking the dyno at 8200 rpm.(3rd gear and also 4th)
Checked the AF ratio's :
Idle - 15.2
Mid - 13.8
WOT - 12.8
I made about 6 runs to verify.
ANY IDEAS?
Had my 2003 stock std rx8 on my own dyno this weekend.
My car was feeling low on power since I bought it in Nov 2007. So I started browsing the net and this Forum for any info. So far the only thing that might make sense is coils. The car has 86000 km on the clock and in very good condition. I'm the second owner and the car's got full service history. (contact the mazda service deparment). Mazda says there is nothing wrong with my car and there is also no fault codes. Did a ECU reset and had a small improvement in midrange. While the car was on the dyno I also checked if all the valves and gizmo's work, they do!
So all I got out the car was 97rwkw(131.08 rwhp) while braking the dyno at 8200 rpm.(3rd gear and also 4th)
Checked the AF ratio's :
Idle - 15.2
Mid - 13.8
WOT - 12.8
I made about 6 runs to verify.
ANY IDEAS?
Asleep at the wheel
Joined: Jan 2008
Posts: 39
Likes: 1
From: South Africa
It's a 6 speed. The dyno is a Dastek dyno. On enertia run the car made a little less hp. When driving the car it feels asif it struggles to get some air into the motor from 6000 rpm upwards. I checked at the engine that the SSV actuator and the VDI actuator opens at WOT on the dyno. Could not check the APV motor for operation. I do not think that the APV itself would make such a big diff.
OH - and have you had the Cat checked out ? many people have found this to be the problem even after dealers say it is OK ....
and I mean pysically take it off and look into it to see if it is blocked
and I mean pysically take it off and look into it to see if it is blocked
Asleep at the wheel
Joined: Jan 2008
Posts: 39
Likes: 1
From: South Africa
Unfortunatly not. Was to pissed off!
Will make some more runs this weekend and save the graphs. But to get Mazda to do a compression check in South Africa is like trying to negotiate with a suicide bomber! Maybe I should remove the cat on the weekend before the dyno and check it out. The graph on the dyno was pretty flat. Didn't have the dips as seen on other graphs here. But the actuators did open each on its own as the revs picked up at WOT.
Will make some more runs this weekend and save the graphs. But to get Mazda to do a compression check in South Africa is like trying to negotiate with a suicide bomber! Maybe I should remove the cat on the weekend before the dyno and check it out. The graph on the dyno was pretty flat. Didn't have the dips as seen on other graphs here. But the actuators did open each on its own as the revs picked up at WOT.
I just got back from the dyno. I thought I'd post my results to add to the knowledge base.
Year: 2007
Mileage: 20,000km
Power mods: MS Intake, Greddy catback
I see the top end is breaking up, like so many dynos I've seen here. Naturally I'm going to be pointed towards new coils and wires but it's disappointing that at my mileage they already need replacing.
Oh, and I was running on 17" steel wheels which are heavier than stock so I figure if I tried again it would be a little higher.
Year: 2007
Mileage: 20,000km
Power mods: MS Intake, Greddy catback
I see the top end is breaking up, like so many dynos I've seen here. Naturally I'm going to be pointed towards new coils and wires but it's disappointing that at my mileage they already need replacing.
Oh, and I was running on 17" steel wheels which are heavier than stock so I figure if I tried again it would be a little higher.
Last edited by qtwre; Jan 27, 2008 at 10:30 PM.
⎝⏠⏝⏠⎠
Joined: Apr 2004
Posts: 8,625
Likes: 5
From: USA
mazdamaniac turbo upgrade (GT3071R) on the greddy turbo kit @ 9 psi
This was the last tuned run that took place last week Monday with the boost controller not setup properly. Since then the boost controller was setup so imagine the jump in torque that takes place from 4-5k rpm on the chart below, taking place at 3-4k, and it holding steady at 230-240 lb/ft torque till around 7.5k rpm. and all the bumps evened out.
To compare, here's my best greddy turbo dyno: https://www.rx8club.com/showpost.php...&postcount=166
This was the last tuned run that took place last week Monday with the boost controller not setup properly. Since then the boost controller was setup so imagine the jump in torque that takes place from 4-5k rpm on the chart below, taking place at 3-4k, and it holding steady at 230-240 lb/ft torque till around 7.5k rpm. and all the bumps evened out.
To compare, here's my best greddy turbo dyno: https://www.rx8club.com/showpost.php...&postcount=166
Last edited by mysql101; Jan 27, 2008 at 05:10 PM.
Thanks for eclipsing my dyno with your majestic dyno. 
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
Thanks for eclipsing my dyno with your majestic dyno.
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
Nice and safe.
I actually found no additional power shooting for anything leaner (i tried all the way up to 12.2:1 on my car above 6500 RPM), so 11:1 is cheap insurance.
10.8:1 is where I figured the safe range would be on the Int-X since it is a little silly about fuel delivery when the density changes.
Thanks for eclipsing my dyno with your majestic dyno.
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
Question for the people... Today on the dyno I pulled the ABS/DSC fuse and I thought I had understood that pulling it would kill the car's ability to sense speed, but the speedometer still worked. I read here a while back that our cars don't have an independent speed sensor, they just use the ABS. Was this poster wrong?
We didn't bother on MySQL's car or mine for that matter. It doesn't need to be done on our cars for whatever reason.
